聚合物
分离器(采油)
材料科学
聚酰亚胺
电解质
锂(药物)
阻燃剂
准固态
易燃液体
陶瓷
化学工程
可燃性
燃烧性
聚合物电解质
离子电导率
复合材料
有机化学
化学
电极
物理化学
内分泌学
工程类
物理
燃烧
热力学
图层(电子)
医学
色素敏化染料
作者
Yi Cui,Jiayu Wan,Yusheng Ye,Kai Li,Lien‐Yang Chou
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-02-05
卷期号:20 (3): 1686-1692
被引量:181
标识
DOI:10.1021/acs.nanolett.9b04815
摘要
Safety issues in lithium-ion batteries have raised serious concerns due to their ubiquitous utilization and close contact with the human body. Replacing flammable liquid electrolytes, solid-state electrolytes (SSEs) is thought to address this issue as well as provide unmatched energy densities in Li-based batteries. However, among the most intensively studied SSEs, polymeric solid electrolyte and polymer/ceramic composites are usually flammable, leaving the safety issue unattended. Here, we report the first design of a fireproof, ultralightweight polymer–polymer SSE. The SSE is composed of a porous mechanic enforcer (polyimide, PI), a fire-retardant additive (decabromodiphenyl ethane, DBDPE), and a ionic conductive polymer electrolyte (poly(ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide). The whole SSE is made from organic materials, with a thin, tunable thickness (10–25 μm), which endorse the energy density comparable to conventional separator/liquid electrolytes. The PI/DBDPE film is thermally stable, nonflammable, and mechanically strong, preventing Li–Li symmetrical cells from short-circuiting after more than 300 h of cycling. LiFePO4/Li half cells with our SSE show a high rate performance (131 mAh g–1 at 1 C) as well as cycling performance (300 cycles at C/2 rate) at 60 °C. Most intriguingly, pouch cells made with our polymer–polymer SSE still functioned well even under flame abuse tests.
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